US20120069164A1 - Image display device, image display system, image presenting method, and computer program - Google Patents

Image display device, image display system, image presenting method, and computer program Download PDF

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Publication number
US20120069164A1
US20120069164A1 US13/322,275 US201113322275A US2012069164A1 US 20120069164 A1 US20120069164 A1 US 20120069164A1 US 201113322275 A US201113322275 A US 201113322275A US 2012069164 A1 US2012069164 A1 US 2012069164A1
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United States
Prior art keywords
shutter
images
light source
section
period
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Abandoned
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US13/322,275
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English (en)
Inventor
Makoto Nakagawa
Yuji Nakahata
Ryo Ogawa
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Sony Corp
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Sony Corp
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Assigned to SONY CORPORATION reassignment SONY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAKAHATA, YUJI, OGAWA, RYO, NAKAGAWA, MAKOTO
Publication of US20120069164A1 publication Critical patent/US20120069164A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/24—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type involving temporal multiplexing, e.g. using sequentially activated left and right shutters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/003—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/341—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using temporal multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/398—Synchronisation thereof; Control thereof
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0237—Switching ON and OFF the backlight within one frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0252—Improving the response speed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/041—Temperature compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2370/00—Aspects of data communication
    • G09G2370/04—Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers

Definitions

  • the present invention relates to an image display apparatus, an image display system, an image presentation method, and a computer program, which are used for display of a stereoscopic image using a shutter mechanism, and alternately switch and display a plurality of images on the screen in a very short cycle, in particular, an image display apparatus, an image display system, an image presentation method, and a computer program, which alternately switch and display a plurality of images on the screen in a very short cycle while preventing crosstalk between the images.
  • a stereoscopic image which appears stereoscopically to an observer can be presented by displaying images with disparity to the left and right eyes.
  • An example of schemes for presenting a stereoscopic image is to have the observer wear glasses having special optical characteristics, and present views with disparity to both eyes.
  • a time-division stereoscopic image display system is made up of a combination of a display apparatus that displays a plurality of mutually different images by time division, and shutter glasses that are worn by the observer of the images.
  • the display apparatus displays a left-eye image L and a right-eye image R alternately on the screen in a very short cycle and, at the same time, separately provides the images to the left eye and the right eye in synchronism with the cycles of the left-eye image L and right-eye image R.
  • the left-eye part of the shutter glasses passes light and the right-eye part blocks light
  • the right-eye image R passes light and the left-eye part blocks light (see, for example, PTLs 1 to 3).
  • a stereoscopic view display method with which, by setting the time to switch both the left-eye shutter and the right-eye shutter to a light-blocking state to be earlier than the time when the frame period switches, a simultaneous light-blocking period during which the left-eye shutter and the right-eye shutter are simultaneously set to the light-blocking state is provided in a part of each frame period, thereby suppressing flicker due to after-images (see, for example, PTL 4).
  • the display apparatus used for display of a stereoscopic image is not limited to a particular form.
  • CRT Cathod Ray Tube
  • PDPs plasma display panels
  • LCDs liquid crystal displays
  • EL electro-luminescence
  • a common type of liquid crystal displays is active matrix in which TFTs (Thin File Transistors) are arranged in individual pixels.
  • TFTs Thin File Transistors
  • a TFT liquid crystal display performs display by driving each pixel by writing an image signal on a scan line by scan line basis from the top of the screen to the bottom, and blocking or passing light radiated from the backlight in each pixel.
  • the left-eye image L and the right-eye image R can be separated by providing a period during which both the shutter mechanisms become simultaneously closed (see, for example, FIG. 7 ).
  • the liquid crystal display performs display at all times, when each of the left and right shutter mechanisms switches to the open state, it takes time for the liquid, crystals used for shuttering to rise.
  • an image that has become dark in this rising portion enters each of the left and right eyes, causing a decrease in brightness at the time of time-division display.
  • An object of the present invention is to provide superior image display apparatus, image display system, image presentation method, and computer program, which are used for display of a stereoscopic image using a shutter mechanism, and can suitably switch and display a plurality of images on the screen alternately in a very short cycle.
  • a further object of the present invention is to provide superior image display apparatus, image display system, image presentation method, and computer program, which can switch and display a plurality of images on the screen alternately in a very short cycle while preventing crosstalk between the images.
  • a display section that switches and displays a plurality of images that are different from each other every sub-frame period
  • a light source section that illuminates the display section while alternating between a lighting operation and an extinguishing operation so as to include a lighting period within each sub-frame period
  • a shutter control section that controls open/close timing with respect to a shutter mechanism for observing the plurality of images while separating the images, so that the shutter mechanism is switched to an open state in a period during which the light source section is extinguished, and is switched to a closed state in a period during which the light source section is lit.
  • the light source section is formed by a light-emitting diode.
  • an image display system including:
  • an image display apparatus including a display section that switches and displays a plurality of images that are different from each other every sub-frame period, a light source section that illuminates the display section while alternating between a lighting operation and an extinguishing operation so as to include a lighting period within each sub-frame period, and a shutter control section that controls open/close timing with respect to the shutter mechanism so that the shutter mechanism is switched to an open state in a period during which the light source section is extinguished, and is switched to a closed state in a period during which the light source section is lit.
  • system refers to a logical aggregation of a plurality of apparatuses (or functional modules for implementing specific functions), and it does not particularly matter whether the apparatuses or functional modules are located within a single casing.
  • the invention as defined in claim 4 of the present application is an image presentation method which separates and presents a plurality of images that are different from each other by an opening/closing operation of a shutter mechanism, the plurality of images being displayed by an image display apparatus having a display section that displays the images and a light source section that illuminates the display section, including:
  • the invention as defined in claim 5 of the present application is a computer program which is described in a computer-readable format so as to execute, on a computer, processing for separating and presenting a plurality of images that are different from each other by an opening/closing operation of a shutter mechanism, the plurality of images being displayed by an image display apparatus having a display section that displays the images and a light source section that illuminates the display section, the computer program causing the computer to function as:
  • image controlling means for switching and displaying the plurality of images that are different from each other every sub-frame period
  • backlight controlling means for causing the light source section to alternate between a lighting operation and an extinguishing operation so as to include a lighting period within each sub-frame period during which the display section displays each of the plurality of images by time division;
  • shutter controlling means for switching the shutter mechanism to an open state in a period during which the light source section is extinguished, and switching the shutter mechanism to a closed state in a period during which the light source section is lit.
  • the computer program according to claim 5 of the present application defines a computer program that is described in a computer-readable format so as to implement predetermined processing on a computer.
  • synergistic operation is exerted on the computer, making it possible to obtain the same operational effect as that of the image display apparatus according to claim 1 of the present application.
  • an image display apparatus including:
  • a display section that switches and displays a plurality of images that are different from each other every sub-frame period
  • a light source section that illuminates the display section while alternating between a lighting operation and an extinguishing operation so as to include a lighting period within each sub-frame period
  • a shutter control section that controls open/close timing with respect to a shutter mechanism for observing the plurality of images while separating the images, so that the shutter mechanism is switched to an open state in a period during which the light source section is lit, and is switched to a closed state in a period during which the light source section is extinguished.
  • an image display apparatus including:
  • a display section that switches and displays a plurality of images that are different from each other every sub-frame period, for each of blocks obtained by splitting a screen into a plurality of parts;
  • a shutter control section that controls open/close timing with respect to a shutter mechanism for observing the plurality of images while separating the images, so that the shutter mechanism is switched to an open state in a period during which at least one of the plurality of light source sections is lit, and is switched to a closed state in a period during which the at least one light source is extinguished.
  • the image display apparatus as defined in claim 7 is configured so that the image display apparatus includes a plurality of shutter mechanisms, and at least one of the plurality of light source sections is lit in a period during which all of the shutter mechanisms are in a closed state.
  • the present invention it is possible to provide superior image display apparatus, image display system, image presentation method, and computer program, which are used for display of a stereoscopic image using a shutter mechanism, and can suitably switch and display a plurality of images on the screen alternately in a very short cycle.
  • the shutter mechanism of the corresponding lens on the shutter glasses side is opened during the time when the backlight is extinguished, and the shutter mechanism is closed while the backlight is lit.
  • the backlight is lit on the liquid crystal display side after the shutter mechanism on the shutter glasses side has responded sufficiently, there is no adverse effect caused by lack of response at the time of rising of the shutter mechanism.
  • the method of intermittently lighting the backlight since the method of intermittently lighting the backlight is employed, it is possible to raise peak brightness, thereby enabling an improvement in brightness when displaying a stereoscopic image.
  • a relatively long lighting time can be secured for the backlight, a drop in the temperature of the liquid crystal display panel following extinguishing of the backlight becomes less, and so does deterioration of crosstalk.
  • FIG. 1 is a diagram schematically showing the configuration of a stereoscopic image display system to which the present invention can be applied.
  • FIG. 2 is a diagram showing the control operation of shutter glasses 20 in an L sub-frame period.
  • FIG. 3 is a diagram showing the control operation of the shutter glasses 20 in an R sub-frame period.
  • FIG. 4 is a diagram showing an operation of opening a shutter mechanism on the shutter glasses side during the time when the backlight is extinguished, and closing the shutter mechanism while the backlight is lit.
  • FIG. 5 is a diagram showing an operation of opening the shutter mechanism on the shutter glasses side during the time when the backlight is lit, and closing the shutter mechanism while the backlight is extinguished.
  • FIG. 6 is a diagram showing an operation for separating a left-eye image L and a right-eye image R in a liquid crystal display in which the screen of a liquid crystal display panel is split into three blocks of upper, middle, and lower parts and driven partially.
  • FIG. 7 is a diagram showing an operation for separating the left-eye image L and the right-eye image R by the opening/closing operation of the shutter mechanism of the shutter glasses, while keeping the backlight of the liquid crystal display lit at all times.
  • FIG. 8 is a diagram showing an operation for separating the left-eye image L and the right-eye image R by lighting the backlight in synchronism with the shutter mechanism of the shutter glasses.
  • FIG. 1 schematically shows the configuration of a stereoscopic image display system 1 to which the present invention can be applied.
  • the stereoscopic image display system 1 shown in the drawing includes a display apparatus 10 that alternately displays a left-eye image L and a right-eye image R on the screen in a very short cycle, and shutter glasses 20 that are worn on the head by an observer.
  • the liquid crystal display 10 includes a liquid crystal display panel 11 , a backlight 12 , an image signal processing section 13 , a shutter control section 14 that controls the open/close timing of the shutter mechanism of the shutter glasses 20 , a timing control section 15 , a backlight control section 16 , a data driver 17 , and a gate driver 18 .
  • the liquid crystal display 10 displays and outputs an image on the basis of an input image signal D in including a right-eye image signal D R and a left-eye image signal D L with a left/right disparity.
  • the liquid crystal display panel 11 is of an active matrix type in which TFTs are arranged in individual pixels.
  • the backlight 12 is a light source that irradiates the liquid crystal display panel 11 with light.
  • the backlight 12 is controlled so as to be switch its lighting (light-emitting) operation and extinguishing operation by time division, on the basis of a control signal CTL B supplied from the backlight control section 16 .
  • the backlight 12 for example, an LED (Light Emitting Diode), a CCFL (Cold Cathode Fluorescent Lamp), or the like can be used. It should be noted, however, that use of a CCFL is susceptible to afterglow, and also the afterglow characteristics differ for each of RGB colors. Accordingly, the following description is given assuming that an LED with relatively little afterglow is used as the backlight 12 .
  • the liquid crystal display panel 11 has a plurality of pixels arrayed in matrix as a whole, and modulates light emitted from the backlight 12 on the basis of an image voltage supplied from the data driver 17 , in accordance with a driving signal supplied from the gate driver 18 , thereby performing image display based on the input image signal D in .
  • the liquid crystal display panel 11 alternately displays the right-eye image R based on the right-eye image signal D R and the left-eye image L based on the left-eye image signal D L by time division, within a predetermined cycle such as a 1-frame period.
  • the image signal processing section 13 controls the write order (that is, the display order) of the right-eye image signal D R and the left-eye image signal D L to the liquid crystal display panel 11 on the basis of the input image signal D in , thereby generating an image signal for the liquid crystal display panel 11 .
  • the image signal processing section 13 from the input image signal D in , the image signal processing section 13 generates an image signal D 1 in which the left-eye image signal D L and the right-eye image signal D R are arranged alternately within a 1-frame period.
  • the display period of the left-eye image L and the display period of the right-eye image R will be referred to as “L sub-frame period” and “R sub-frame period”, respectively.
  • the timing control section 15 controls the drive timing of each of the gate driver 18 and the data driver 17 , and supplies the image signal D 1 supplied from the image signal processing section 13 to the data driver 17 .
  • the timing control section 15 may be configured to perform overdrive processing for the image signal D 1 .
  • the gate driver 18 sequentially, drives pixels in the liquid crystal display panel 11 along gate lines, in accordance with timing control by the timing control section 15 .
  • the data driver 17 supplies an image voltage based on the image signal D 1 supplied from the timing control section 15 , to each of the pixels in the liquid crystal display panel 11 . Specifically, D/A conversion is applied to the image signal D 1 to generate an analog image signal corresponding to the image voltage, and the analog image signal is outputted to each of the pixels.
  • the shutter control section 14 outputs, to shutter glasses 20 , a timing control signal CTL for controlling the switching of opening and closing of the left and right shutter mechanisms, which corresponds to the output timing of each of the right-eye image signal D R and the left-eye image signal D L by the image signal processing section 13 .
  • a timing control signal CTL for controlling the switching of opening and closing of the left and right shutter mechanisms, which corresponds to the output timing of each of the right-eye image signal D R and the left-eye image signal D L by the image signal processing section 13 .
  • wire communication by connecting the shutter glasses 20 to the liquid crystal display 10 .
  • Japanese Patent Application No. 2009-276948 which has already been assigned to the present applicant discloses an image display system in which the liquid crystal display 10 and the shutter glasses 20 are connected to each other by a wireless network such as IEEE802.15.4.
  • the shutter glasses 20 are worn by an observer (not shown in FIG. 1 ) of the liquid crystal display 10 to enable stereoscopic vision.
  • the shutter glasses 20 have a left-eye lens 21 L and a right-eye lens 21 R.
  • the left-eye lens 21 L and the right-eye lens 21 R are each provided with a light-blocking shutter (not shown) for blocking the opening from light.
  • the light-blocking shutters are each formed by, for example, a liquid crystal shutter.
  • the enable state of the light-blocking function in these light-blocking shutters that is, the closed state
  • the disable state that is, the open state
  • the shutter control section 14 controls the light-blocking shutters of the, shutter glasses 20 so that the open state and closed state of each of the left-eye lens 21 R and the right-eye lens 21 L switch alternately in accordance with the respective display periods of the left-eye image L and right-eye image R. Specifically, the shutter control section 14 performs control for setting the light-blocking shutter of the left-eye lens 21 L to the open state and setting the light-blocking shutter of the right-eye lens 21 R to the closed state in the L sub-frame period, and for setting the initial light-blocking shutter of the right-eye lens 21 R to the open state and setting the light-blocking shutter of the left-eye lens 21 L to the closed state in the R sub-frame period.
  • FIG. 2 shows the control operation of the shutter glasses 20 in the L sub-frame period.
  • the shutter of the left-eye lens 21 L is set to the open state
  • the shutter of the right-eye lens 21 R is set to the closed state, so that display light LL based on the left-eye image L passes through only the left-eye lens 21 L.
  • FIG. 3 shows the control operation of the shutter glasses 20 in the R sub-frame period.
  • the shutter of the right-eye lens 21 R is set to the open state, and the shutter of the left-eye lens 21 L is set to the closed state, so that display light RR based on the right-eye image R passes through only the right-eye lens 21 R.
  • the backlight control section 16 supplies a timing control signal (control signal CTL B ), which corresponds to the output timing of each of the right-eye image signal D R and the left-eye image signal D L by the image signal processing section 13 , to the backlight 12 .
  • the backlight control section 13 controls the lighting operation and extinguishing operation of the backlight 12 so as to switch by time division, in synchronism with switching of display between the left-eye image L and the right-eye image R.
  • the backlight control section 16 lights the backlight 12 at predetermined timing (start time) and duty (duration), in the respective display periods of the left-eye image L and right-eye image R.
  • the left-eye image L and the right-eye image R can be separated by, for example, keeping the backlight lit at all times, and providing a no-display period during which both the shutters become simultaneously closed, when alternately switching the open and close states of the left and right shutter mechanisms in the shutter glasses 20 .
  • the backlight 12 is kept lit at all times, and the period during which the display light LL based on the left-eye image L passes through only the left-eye lens 21 L (left-eye image L display period), and the period during which the display light RR based on the right-eye image R passes through only the right-eye lens 21 R (right-eye image R display period) are arranged alternately, while being separated by the no-display period during which both the shutter mechanisms become simultaneously closed.
  • the backlight 12 in synchronism with the left and right shutter mechanisms on the shutter glasses 20 side, rather than lighting the backlight 12 at all times.
  • the period for which each of the left and right shutters is set to the open state is relatively long.
  • the backlight 12 is lit intermittently within the open period of each of the left and right shutter mechanisms, thereby alternately creating a period during which the display light LL based on the left-eye image L passes through only the left-eye lens 21 L (left-eye image L display period), and a period during which the display light RR based on the right-eye image R passes through only the right-eye lens 21 R (right-eye image R display period).
  • the lighting period of the backlight 12 By placing the lighting period of the backlight 12 so as to avoid the rise time within the open period of the shutter mechanism, it is possible to prevent an image from becoming dark. Also, in the case where an LED is used as the backlight 12 , since peak brightness increases by making its lighting period short, thereby achieving an improvement in brightness when displaying a stereoscopic image. However, when the lighting period of the backlight 12 is set short, although power consumption drops, the quantity of heat released decreases, causing the response speed of the liquid crystal display panel 11 to drop. When the response speed of the liquid crystal display panel 11 drops, there is a problem in that crosstalk deteriorates.
  • the period during which the display light LL based on the left-eye image L passes through only the left-eye lens 21 L, and the period during which the display light RR based on the right-eye image R passes through only the right-eye lens 21 R need to be separated by a no-display period of a predetermined duration or more in which both the shutter mechanisms become simultaneously closed, or the backlight is extinguished.
  • the duty of the lighting period of the backlight 12 (BL lighting period) must be limited to, for example, 25% or less.
  • the period during which each of the shutter mechanisms of the left-eye lens 21 L and right-eye lens 21 R opens is the period during which light passes through only the left-eye lens 21 L or the right-eye lens 21 R, so the duty of the lighting period (BL lighting period) during which the backlight 12 lights up can be set to 100%. In this case, there is no drop in the temperature of the liquid crystal display panel 11 , and no crosstalk occurs, but the brightness of the display image drops.
  • the brightness when displaying a stereoscopic image and crosstalk are in a tradeoff relationship with respect to the duration of the lighting period of the backlight.
  • the present inventors propose a method of opening the shutter mechanism of the corresponding one of the left and right lenses 21 L and 21 R in the period during which the backlight 12 is extinguished, and closing the shutter mechanism while the backlight 12 is lit.
  • the backlight control section 16 supplies a timing control signal (control signal CTL B ), which corresponds to the output timing of each of the right-eye image signal D R and the left-eye image signal D L by the image signal processing section 13 , to the backlight 12 , thereby intermittently lighting the backlight 12 in each of the L sub-frame period and the R sub-frame period.
  • a timing control signal (control signal CTL B ) which corresponds to the output timing of each of the right-eye image signal D R and the left-eye image signal D L by the image signal processing section 13 , to the backlight 12 , thereby intermittently lighting the backlight 12 in each of the L sub-frame period and the R sub-frame period.
  • the shutter control section 14 outputs, to the shutter glasses 20 , a timing control signal CTL for switching the light-blocking shutter of the left-eye lens 21 L to the open state in a period during which the backlight 12 is extinguished within the L sub-frame period on the basis of the output timing of the left-eye image signal D L by the image signal processing section 13 .
  • the shutter of the left-eye lens 21 L is set to the open state
  • the shutter of the right-eye lens 21 R is set to the closed state, so that the display light LL based on the left-eye image L passes through only the left-eye lens 21 L.
  • the backlight 12 lights up, and on the shutter glasses 20 side, the shutter of the left-eye lens 21 L is switched to the closed state within the period during which the backlight is lit, resulting in a no-display period during which both the left and right shutter mechanisms are simultaneously closed.
  • the shutter control section 14 outputs, to the shutter glasses 20 , a timing control signal CTL for switching the light-blocking shutter of the right-eye lens 21 R to the open state in a period during which the backlight 12 is extinguished within the R sub-frame period on the basis of the output timing of the left-eye image signal D R by the image signal processing section 13 .
  • the shutter of the right-eye lens 21 R is set to the open state
  • the shutter of the left-eye lens 21 L is set to the closed state, so that the display light RR based on the left-eye image L passes through only the right-eye lens 21 R.
  • the backlight 12 lights up, and on the shutter glasses 20 side, the shutter of the right-eye lens 21 R is switched to the closed state within the period during which the backlight is lit, resulting in a no-display period during which both the left and right shutter mechanisms are simultaneously closed.
  • the backlight is extinguished at the point in time when each of the shutters of the left-eye lens 21 L and right-eye lens 21 R switches to the open state (as mentioned previously), and lights up after the shutter has switched to the open/close state and further the rise time of the liquid crystals of the shutter has elapsed. Thereafter, the backlight 12 is extinguished within the no-display period during which neither the left-eye lens 21 L nor the right-eye lens 21 R passes display light for the liquid crystal display 10 , when switching the open and close states of each of, the left and right shutter mechanisms.
  • the duty of the backlight 12 can be made as large as, for example, 50%.
  • the lighting period of the backlight 12 directly equates to the period during which light passes through only the left-eye lens 21 L or the right-eye lens 21 R.
  • the duty of the backlight 12 must be limited to, for example, 25% or less (as mentioned previously).
  • the brightness when displaying a stereoscopic image and crosstalk are in a tradeoff relationship with respect to the duration of the lighting period of the backlight.
  • the relationship between the respective drive methods for the backlight 12 shown in FIGS. 7 , 8 , and 4 , the brightness when displaying a stereoscopic image, and crosstalk is summarized in the table below. It should be noted that the quantity of current allowed to flow through the backlight is set as appropriate in accordance with the power supply substrate or backlight element, and the values shown in Table 1 are merely an example.
  • the duty at which the backlight 12 lights up is 100%, and although the brightness when displaying a stereoscopic image drops, crosstalk can be prevented.
  • the duty of the backlight 12 must be limited to, for example, 25% or less.
  • the brightness when displaying a stereoscopic image improves, there is a fear that crosstalk may occur.
  • the duty of the backlight 12 can be made as large as, for example, 50%.
  • the brightness when displaying a stereoscopic image can be improved while preventing crosstalk.
  • the backlight control section 16 supplies a timing control signal (control signal CTL B ), which corresponds to the output timing of each of the right-eye image signal D R and the left-eye image signal D L by the image signal processing section 13 , to the backlight 12 , thereby intermittently lighting the backlight 12 in each of the L sub-frame period and the R sub-frame period.
  • a timing control signal (control signal CTL B ) which corresponds to the output timing of each of the right-eye image signal D R and the left-eye image signal D L by the image signal processing section 13 , to the backlight 12 , thereby intermittently lighting the backlight 12 in each of the L sub-frame period and the R sub-frame period.
  • the shutter control section 14 outputs, to the shutter glasses 20 , a timing control signal CTL for switching the light-blocking shutter of the left-eye lens 21 L to the open state in a period during which the backlight 12 is lit within the L sub-frame period on the basis of the output timing of the left-eye image signal D L by the image signal processing section 13 .
  • the shutter of the left-eye lens 21 L is set to the open state
  • the shutter of the right-eye lens 21 R is set to the closed state, so that the display light LL based on the left-eye image L passes through only the left-eye lens 21 L.
  • the shutter of the left-eye lens 21 L is switched to the closed state within the period during which the backlight 12 is extinguished, resulting in a no-display period during which both the left and right shutter mechanisms are simultaneously closed.
  • the shutter control section 14 outputs, to the shutter glasses 20 , a timing control signal CTL for switching the light-blocking shutter of the right-eye lens 21 R to the open state in a period during which the backlight 12 is lit within the R sub-frame period on the basis of the output timing of the right-eye image signal D R by the image signal processing section 13 .
  • the shutter of the right-eye lens 21 R is set to the open state
  • the shutter of the left-eye lens 21 L is set to the closed state, so that the display light RR based on the left-eye image L passes through only the right-eye lens 21 R.
  • the shutter of the right-eye lens 21 R is switched to the closed state within the period during which the backlight 12 is extinguished, resulting in a no-display period during which both the left and right shutter mechanisms are simultaneously closed.
  • the duty of the backlight 12 can be made as large as, for example, 50%, and the brightness when displaying a stereoscopic image can be improved while preventing crosstalk.
  • liquid crystal displays there are products of a partial drive type in which the screen of the liquid crystal panel is split into a plurality of blocks, and display is switched on a block-by-block basis.
  • a partial drive type liquid crystal display it is necessary to display the left-eye image L and the right-eye image R alternately on the screen and, at the same time, separately provide the images to the left eye and the right eye in synchronism with the cycles of the left-eye image L and right-eye image R.
  • FIG. 6 by taking as an example a liquid crystal display in which the screen of the liquid crystal panel is split into three blocks of upper, middle, and lower parts, and the backlight is driven partially.
  • Each of backlights that irradiates each of the blocks lights up intermittently in the L sub-frame period and the R sub-frame period.
  • writing to the liquid crystal display is performed in a line sequential manner from the upper part of the screen, and the backlights are lit from the upper part of the screen in the order of the middle part of the screen and then the lower part of the screen.
  • the backlights are lit from the lower part of the screen in the order of the middle part of the screen and then the upper part of the screen.
  • the shutter mechanism of either the corresponding left or right lens 21 L/R on the shutter glasses 20 side is switched to the open state in a period during which the backlight irradiating at least one of the blocks obtained by splitting the screen is lit. Then, the corresponding shutter mechanism is switched to the closed state in a period during which the same backlight is extinguished. In the example shown in FIG. 6 , such opening/closing operation of the shutter mechanism is performed in the upper part of the screen.
  • the opening and closing of the shutter mechanism are switched in a period during which the backlight is extinguished, and the lighting period of the backlight is contained within a period during which the shutter mechanism is in the open state. Also, in the lower part of the screen, the shutter mechanism switches to the open state in a period during which the backlight is extinguished, and the shutter mechanism switches to the closed state in a period during which the backlight is lit.
  • the brightness when displaying a stereoscopic image can be improved. Also, by increasing the duty of each backlight, crosstalk can be prevented.
  • the period during which both the left and right shutter mechanisms are in the closed state on the shutter glasses side becomes a no-display period during which neither the left lens nor right lens passes display light based on an image intended for each eye.
  • the backlights for all of the blocks are lit all at once (or the backlight for at least one of the blocks is lit) to increase duty, thereby preventing a drop in the temperature of the liquid crystal display panel in the extinguishing period of the backlight in order to maintain response speed.
  • the series of processing according to the embodiments described in this specification can be executed by either of hardware and software. If the processing is to be implemented by software, a computer program describing the procedure of the processing in the software in a computer-readable format may be installed and executed on a predetermined computer. Also, this computer program can be previously embedded in a product such as a liquid crystal display.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
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JP2010081029A JP2011216998A (ja) 2010-03-31 2010-03-31 映像表示装置、映像表示システム、映像提示方法、並びにコンピューター・プログラム
JP2010-081029 2010-03-31
PCT/JP2011/055647 WO2011122291A1 (ja) 2010-03-31 2011-03-10 映像表示装置、映像表示システム、映像提示方法、並びにコンピューター・プログラム

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EP2421277A1 (en) 2012-02-22
EP2421277A4 (en) 2013-03-27
TW201213860A (en) 2012-04-01
WO2011122291A1 (ja) 2011-10-06
JP2011216998A (ja) 2011-10-27

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